high7.8
CVE-2026-55041
Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
Impact
Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Microsoft | 365 Apps | All versions |
| Microsoft | Excel | Version 2016 |
| Microsoft | Microsoft 365 | All versions |
| Microsoft | Office 2019 | All versions |
| Microsoft | Office 2021 | All versions |
| Microsoft | Office 2024 | All versions |
| Microsoft | Office Online Server | before 16.0.10417.20175 |
| Microsoft | Microsoft 365 Apps For Enterprise | from 16.0.1 before https://aka.ms/OfficeSecurityReleases |
| Microsoft | Microsoft Excel 2016 | from 16.0.0.0 before 16.0.5561.1001 |
| Microsoft | Microsoft Office 2019 | from 19.0.0 before https://aka.ms/OfficeSecurityReleases |
| Microsoft | Microsoft Office 365 For Mac | from 1.0.0 before 16.111.26071215 |
| Microsoft | Microsoft Office LTSC 2021 | from 16.0.1 before https://aka.ms/OfficeSecurityReleases |
| Microsoft | Microsoft Office LTSC 2024 | from 16.0.0 before https://aka.ms/OfficeSecurityReleases |
| Microsoft | Microsoft Office LTSC For Mac 2021 | from 16.0.1 before 16.111.26071215 |
| Microsoft | Microsoft Office LTSC For Mac 2024 | from 16.0.0 before 16.111.26071215 |
| Microsoft | Office Online Server | from 16.0.0.0 before 16.0.10417.20175 |